Are there plans to extend language syntax support?

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I'll see if we can add this in Wing 7.2. We use Scintilla as the core of our editor and that has a lexer for Rust so that should be doable. I did not see one for Typescript but maybe that's close enough to another language to not be needed. You can try this out by opening a file, right-clicking to select Properties, and then choosing different File Types under the File Attributes tab to see if there is one that works. Then you can map that file extension to the file type in the Files > File Types > Extra File Types preference in Wing.